Re: [PATCH v2 1/1] mm: swap: remove duplicate nr_swap_pages decrement in get_swap_page_of_type()

On Sun, 2 Nov 2025 17:24:56 +0900 Youngjun Park youngjun.park@lge.com wrote:

After commit 4f78252da887, nr_swap_pages is decremented in swap_range_alloc(). Since cluster_alloc_swap_entry() calls swap_range_alloc() internally, the decrement in get_swap_page_of_type() causes double-decrementing.

Remove the duplicate decrement.

Can we please have a description of the userspace-visible runtime effects of the bug?

Fixes: 4f78252da887 ("mm: swap: move nr_swap_pages counter decrement from folio_alloc_swap() to swap_range_alloc()") Cc: stable@vger.kernel.org # v6.17-rc1

Especially when proposing a backport.

Thanks.